Bolt Load Retention and Creep Response of AS41 Alloyed with 0.15 % Ca

Paper #:
  • 2010-01-0404

Published:
  • 2010-04-12
DOI:
  • 10.4271/2010-01-0404
Citation:
Anopuo, O., Huang, Y., Hort, N., Dieringa, H. et al., "Bolt Load Retention and Creep Response of AS41 Alloyed with 0.15 % Ca," SAE Int. J. Mater. Manuf. 3(1):202-210, 2010, https://doi.org/10.4271/2010-01-0404.
Pages:
9
Abstract:
Understanding the creep and bolt load retention (BLR) behavior of promising Mg-Al alloys are crucial to developing elevated temperature resistance alloys. This is especially true for elevated temperature automotive applications with a prevalence of bolted joints. In this study, creep and fastener clamp load response of Mg-Al alloy AS41 was investigated and compared to that of Mg4Al and AS41 micro-alloyed with 0.15 % Ca. A compliance-creep approach was used to model the response of these Mg-Al alloys at bolted joints. The equation prediction of the BLR response and experimental results are in good agreement. AS41+0.15 Ca shows improved creep and BLR properties up to 175°C. A correlation between the microstructures, creep and BLR results reveal that the formation of a ternary CaMgSi phase is responsible for the improved elevated temperature behavior.
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